基于聚类分析的双馈机组风电场动态等值模型的研究

针对大型双馈机组风电场,提出一种新的动态等效建模方法。该方法是一种基于双馈风力发电机暂态电压特性的聚类分群方法,即根据风电场内各双馈发电机受系统故障影响程度的不同,识别出电压的动态响应行为相近的风力发电机,并对分群后的双馈发电机及其电气接线系统进行等值聚合,实现了双馈机组风电场的动态等值多机表征。利用电力系统分析综合程序(PSASP 6.2),搭建了双馈机组风电场详细模型和等值模型,并与传统的单机等值模型进行了比较分析。结果表明,所建立的多机等值模型能够较准确地反映双馈机组风电场并网点的动态特性。

Study on dynamic equivalence of wind farms with DFIG based on clustering analysis

For large-scale wind farms with doubly fed induction generator(DFIG),a new dynamic equivalent modeling method is proposed.This method uses the transient voltage characteristics as the grouping rule of wind turbines.According to different impacting extent of the wind farm with DFIG during system faults,wind turbines with similar dynamic behaviors are identified.Same group wind turbines are aggregated,and the dynamic multi-machine equivalent model of the wind farm with DFIG is obtained.Simulations of detailed and equivalent models of wind farms with DFIG are built by power system analysis software 6.2(PSASP 6.2).Compared with the single-machine equivalent method,the results show that the proposed multi-machine equivalent model more accurately describes the dynamic characteristics of a wind farm at the grid connection point.